Active oxygen by Ce-Pr mixed oxide nanoparticles outperform diesel soot combustion Pt catalysts

作者：Guillen Hurtado Noelia; Garcia Garcia Avelina; Bueno Lopez Agustin^*

来源：Applied Catalysis B: Environmental , 2015, 174: 60-66.

DOI：10.1016/j.apcatb.2015.02.036

• Nanoparticles
• Radicals
• Ceria
• Soot
• Active oxygen

A Ce0.5Pr0.5O2 mixed oxide has been prepared with the highest surface area and smallest particle size ever reported (125 m(2)/g and 7 nm, respectively), also being the most active diesel soot combustion catalyst ever tested under realistic conditions if catalysts forming highly volatile species are ruled out. This Ce-Pr mixed oxide is even more active than a reference platinum-based commercial catalyst. This study provides an example of the efficient participation of oxygen species released by a ceria catalyst in a heterogeneous catalysis reaction where both the catalyst and one of the reactants (soot) are solids. It has been concluded that both the ceria-based catalyst composition (nature and amount of dopant) and the particle size play key roles in the combustion of soot through the active oxygen-based mechanism. The composition determines the production of active oxygen and the particle size the transfer of such active oxygen species from catalyst to soot.

• 出版日期2015-9